package com.nowcoder.community.service;

import com.nowcoder.community.entity.LoginTicket;
import com.nowcoder.community.entity.User;
import com.nowcoder.community.repository.LoginTicketMapper;
import com.nowcoder.community.repository.UserMapper;
import com.nowcoder.community.util.CommunityConstant;
import com.nowcoder.community.util.CommunityUtil;
import com.nowcoder.community.util.MailClient;
import com.nowcoder.community.util.RedisKeyUtil;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;
import org.thymeleaf.TemplateEngine;
import org.thymeleaf.context.Context;

import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;
import java.util.concurrent.TimeUnit;

/**
 * @author tang
 * @create 2020-10-25
 */
@Service
public class UserService implements CommunityConstant {

    @Autowired
    private UserMapper userMapper;
    @Autowired
    private MailClient mailClient;
//    @Autowired
//    private LoginTicketMapper loginTicketMapper;
    @Autowired
    private RedisTemplate redisTemplate;
    @Autowired
    private TemplateEngine templateEngine;

    @Value("${community.path.domain}")
    private String domain;
    @Value("${server.servlet.context-path}")
    private String contextPath;

    public User findUserById(int id){
//        return userMapper.selectById(id);
        User user = getCache(id);
        if (user ==null){
            user =initCache(id);
        }
        return user;
    }


    public Map<String,Object> register(User user) throws IllegalAccessException {
        Map<String,Object> map = new HashMap<>();

        if (user ==null){
            throw new IllegalAccessException("the user cant be empty");
        }
        if (StringUtils.isBlank(user.getUsername())){
            map.put("usernameMsg","账号不能为空");
            return map;
        }
        if (StringUtils.isBlank(user.getPassword())){
            map.put("passwordMsg","密码不能为空");
            return map;
        }
        if (StringUtils.isBlank(user.getEmail())){
           map.put("emailMsg","邮箱不能为空");
           return map;
        }

        User u = userMapper.selectByName(user.getUsername());
        if (u!=null){
            map.put("usernameMsg","该账号已经存在！");
            return map;
        }

        u = userMapper.selectByEmail(user.getEmail());
        if (u!=null){
            map.put("emailMsg","该邮箱已经被注册");

            System.out.println("邮箱已经注册");
            return map;
        }


        /**
         * 注册用户
         */
        user.setSalt(CommunityUtil.generateUUID().substring(0,5));
        user.setPassword(CommunityUtil.md5(user.getPassword()+user.getSalt()));
        user.setType(0);
        user.setStatus(0);
        user.setActivationCode(CommunityUtil.generateUUID());
        user.setHeaderUrl(String.format("http://images.nowcoder.com/head/%dt.png",new Random().nextInt(1000)));
        user.setCreateTime(new Date());
        userMapper.insertUser(user);


        /**
         *激活邮件
         */
        Context context = new Context();
        context.setVariable("email",user.getEmail());

        String url = domain+contextPath+"/activation/"+user.getId()+"/"+user.getActivationCode();
        context.setVariable("url",url);

        String content = templateEngine.process("/mail/activation",context);
        try{
            mailClient.sendMail(user.getEmail(),"激活账号",content);
        }catch (Exception e){
            e.printStackTrace();
        }

        return map;
    }

    public int activation(int userId,String code){
        User user = userMapper.selectById(userId);

        if (user.getStatus()==1){
            return ACTIVATION_REPEAT;
        }else if (user.getActivationCode().equals(code)){
            userMapper.updateStatus(userId,1);
            clearCache(userId);
            return ACTIVATION_SUCCESS;
        }else {
            return ACTIVATION_FAILURE;
        }


    }
    public Map<String, Object> login(String username, String password, int expiredSeconds) {
        Map<String, Object> map = new HashMap<>();

        // 空值处理
        if (StringUtils.isBlank(username)) {
            map.put("usernameMsg", "账号不能为空!");
            return map;
        }
        if (StringUtils.isBlank(password)) {
            map.put("passwordMsg", "密码不能为空!");
            return map;
        }

        // 验证账号
        User user = userMapper.selectByName(username);
        if (user == null) {
            map.put("usernameMsg", "该账号不存在!");
            return map;
        }

        // 验证状态
        if (user.getStatus() == 0) {
            map.put("usernameMsg", "该账号未激活!");
            return map;
        }

        // 验证密码
        password = CommunityUtil.md5(password + user.getSalt());
        if (!user.getPassword().equals(password)) {
            map.put("passwordMsg", "密码不正确!");
            return map;
        }

        // 生成登录凭证
        LoginTicket loginTicket = new LoginTicket();
        loginTicket.setUserId(user.getId());
        loginTicket.setTicket(CommunityUtil.generateUUID());
        loginTicket.setStatus(0);
        loginTicket.setExpired(new Date(System.currentTimeMillis() + expiredSeconds * 1000));
//        loginTicketMapper.insertLoginTicket(loginTicket);

        String redisKey = RedisKeyUtil.getTicketKey(loginTicket.getTicket());
        redisTemplate.opsForValue().set(redisKey,loginTicket);

        map.put("ticket", loginTicket.getTicket());
        return map;
    }

    public void  logout(String ticket){
        String redisKey = RedisKeyUtil.getTicketKey(ticket);
        LoginTicket loginTicket = (LoginTicket) redisTemplate.opsForValue().get(redisKey);
        loginTicket.setStatus(1);
        redisTemplate.opsForValue().set(redisKey,loginTicket);
    }

    public LoginTicket findLoginTicket(String ticket){
        String redisKey = RedisKeyUtil.getTicketKey(ticket);
        return (LoginTicket) redisTemplate.opsForValue().get(redisKey);
//        return loginTicketMapper.selectByTicket(ticket);
    }

    public int updateHeader(int userId,String headerUrl){
        int rows= userMapper.updateHeader(userId,headerUrl);
        clearCache(userId);
        return rows;
    }

    // 1.优先从缓存中取值
    private User getCache(int userId) {
        String redisKey = RedisKeyUtil.getUserKey(userId);
        return (User) redisTemplate.opsForValue().get(redisKey);
    }

    // 2.取不到时初始化缓存数据
    private User initCache(int userId) {
        User user = userMapper.selectById(userId);
        String redisKey = RedisKeyUtil.getUserKey(userId);
        redisTemplate.opsForValue().set(redisKey, user, 3600, TimeUnit.SECONDS);
        return user;
    }

    // 3.数据变更时清除缓存数据
    private void clearCache(int userId) {
        String redisKey = RedisKeyUtil.getUserKey(userId);
        redisTemplate.delete(redisKey);
    }
}
